What Is Posterior Lumbar Fusion?
The posterior approach to lumbar fusion works from the back of the body, giving the surgeon direct access to the vertebrae, the spinal canal, and the posterior elements of the spine in a single surgical corridor. Pedicle screws are anchored into the vertebral bodies on both sides and linked by rods that set and hold the spine in its correct alignment. Bone graft, either harvested from the patient, sourced from a bone bank, or a combination of both, is packed alongside the instrumented levels, where it triggers a biological process that gradually replaces it with living bone, bridging the vertebrae together permanently.
PLIF and TLIF: Adding Interbody Support
In many posterior lumbar fusion cases, an interbody cage packed with bone graft is also placed directly into the disc space to restore the disc height that degeneration has lost, improve overall spinal alignment, and increase fusion rates. When this interbody component is added through a posterior approach, the procedure is referred to as PLIF, Posterior Lumbar Interbody Fusion, or TLIF, Transforaminal Lumbar Interbody Fusion, depending on the trajectory used to access the disc space. PLIF approaches the disc from both sides of the midline; TLIF enters through one side via the foramen, which requires less nerve retraction. Both are effective, and the choice between them is dictated by the patient's anatomy and the specific goals of the surgery.
Minimally Invasive Technique
Applying minimally invasive principles to posterior lumbar fusion changes the recovery experience in ways patients notice immediately. Smaller incisions and muscle-sparing retraction techniques mean the soft tissue surrounding the fusion site heals alongside it rather than recovering from its own separate trauma. The result is a lower post-operative pain burden, less blood loss during surgery, and a hospital stay that is as short as the clinical situation allows. Our surgical team's track record includes some of the shortest hospital stays in the NYU system, not as a point of pride, but as a measurable reflection of what this approach consistently delivers.